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Discrete Bass Booster Circuit

This bass booster circuit can be used filter the input signal as part of internal circuit of an active subwoofer circuit. This circuit is not only boost the bass (low) frequency, but also attenuate high frequency as well. You might consider this circuit as low pass filter, since the high frequency response is not flat, not really as expected in a bass-boost that only boost the bass frequency without cutting the high frequency.

You can see int he schematic diagram, that the actual implementation of this boosting is by attenuating the high frequency, then amplifying the signal to give the boost. This high frequency attenuation is done by the 100nF C2, then amplified by transistor Q1, and attenuated again by 100nF C3. [Circuit's schematic diagram source: extremecircuits.net]

Digitally Controlled Phase ShifterAs shown in a schematic diagram below, this circuit implementation of phase shifter circuit is well suited to using digital potentiometer to control the resistive control element of the phase...

Phase-Shift Meter for Audio Frequency SignalSimple phase shift measurement can be done by squaring both the measured and the reference, then compute the difference of the two signals. The accuracy of the circuit shown in...

Single Op-Amp 3 Band Equalizer circuitThis is a 3 Band Equalizer circuit. This circuit is made to control the treble, middle and bass range. This circuit uses a single op-amp. With single op-amp we can...

Low Pass Filter with Enhanced Step ResponseEffect on the system’s time-domain response is a common problem when designing lowpass filters. The system may fail to recognize significant changes in time because pushing the cuttoff frequency lower...